Revert biome rework (#38724)

* Revert "Fix world generation (#38713)"

This reverts commit 10fa6ff4af.

* Revert "Biome rework (#37735)"

This reverts commit fe7b96147c.

Content.Shared/Procedural/PostGeneration/MiddleConnectionDunGen.cs

@@ -0,0 +1,33 @@
+using Content.Shared.EntityTable;
+using Content.Shared.Maps;
+using Content.Shared.Storage;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Procedural.PostGeneration;
+
+/// <summary>
+/// Places the specified entities on the middle connections between rooms
+/// </summary>
+public sealed partial class MiddleConnectionDunGen : IDunGenLayer
+{
+    /// <summary>
+    /// How much overlap there needs to be between 2 rooms exactly.
+    /// </summary>
+    [DataField]
+    public int OverlapCount = -1;
+
+    /// <summary>
+    /// How many connections to spawn between rooms.
+    /// </summary>
+    [DataField]
+    public int Count = 1;
+
+    [DataField(required: true)]
+    public ProtoId<ContentTileDefinition> Tile;
+
+    [DataField(required: true)]
+    public ProtoId<EntityTablePrototype> Contents;
+
+    [DataField]
+    public ProtoId<EntityTablePrototype>? Flank;
+}